Generac 9934 100A 1ph-120/240V Service Rated Nema 3R Automatic Transfer Switch Features:
Generac 9934 100A Service-Rated Automatic Transfer Switch (1Ø, 120/240V)
The Generac 9934 100 Amp Service-Rated Automatic Transfer Switch is built to serve as both a power management solution and a primary service disconnect, making it an ideal choice for streamlined standby generator installations. Designed for seamless integration with Generac generators using Evolution™, Power Zone™ 200, and Power Zone™ 410 controllers, this switch automatically transitions your home or business to backup power during an outage and safely returns it once utility power is restored—all without manual intervention.
What sets this model apart is its service entrance rating with an integrated utility service circuit breaker, allowing it to function as the main disconnect for your electrical system. This eliminates the need for additional external disconnects in many installations, simplifying wiring, reducing equipment costs, and helping meet code requirements more efficiently. The open transition transfer design ensures safe switching between power sources while maintaining reliable operation under varying load conditions.
Durability and long-term reliability are at the core of this unit’s design. The heavy-duty Generac contactor is engineered for years of dependable switching, while the NEMA 3R aluminum enclosure provides protection against weather, corrosion, and environmental exposure. A baked-on powder coat finish adds another layer of resilience, making it suitable for both indoor and outdoor applications. Installation is further simplified with a fast-mount hanging system, helping reduce labor time and improve installer efficiency.
With all sensing, timing, and transfer logic controlled directly by the generator, the system operates with precision and minimal complexity. Adjustable voltage thresholds, startup delays, and exercise cycles allow for tailored performance, while manual operation capability ensures accessibility during maintenance or servicing. Backed by a 5-year limited warranty, the Generac 9934 delivers a dependable, code-compliant solution for automatic standby power systems.
Key Features
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100 Amp service-rated automatic transfer switch with integrated service disconnect
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120/240V single-phase (1Ø) configuration
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Designed for use with Generac Evolution™, Power Zone™ 200 & 410 controllers
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Service entrance rated with built-in utility service circuit breaker
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Open transition automatic transfer for safe power switching
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Generator-controlled timing, sensing, and transfer operation
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Adjustable voltage drop-out and pickup settings for optimized system response
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NEMA 3R aluminum enclosure for indoor/outdoor durability
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Powder-coated finish for corrosion and weather resistance
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Heavy-duty Generac contactor for long service life
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Fast-mount installation system for quicker setup
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Manual operation capability without power applied
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ETL listed with 10,000 amp withstand rating
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5-year limited warranty
